• 제목/요약/키워드: peptide inhibitor

검색결과 221건 처리시간 0.026초

Characterization of Antihypertensive Angiotensin I-Converting Enzyme Inhibitor from Saccharomyces cerevisiae

  • KIM, JAE-HO;LEE, DAE-HYOUNG;JEONG, SEOUNG-CHAN;CHUNG, KUN-SUB;LEE, JONG-SOO
    • Journal of Microbiology and Biotechnology
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    • 제14권6호
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    • pp.1318-1323
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    • 2004
  • This study describes the purification and characterization of a novel antihypertensive angiotensin 1­converting enzyme (ACE) inhibitory peptide from Saccharomyces cerevisiae. Maximal production of the ACE inhibitor from Saccharomyces cerevisiae was obtained from 24 h of cultivation at $30^{\circ}C$ and its ACE inhibitory activity was increased by about 1.5 times after treatment of the cell-free extract with pepsin. After the purification of ACE inhibitory peptides with ultrafiltration, Sephadex G-25 column chromatography, and reverse-phase HPLC, an active fraction with an $IC_{50}$ of 0.07 mg and $3.5\%$ yield was obtained. The purified peptide was a novel decapeptide, showing very low similarity to other ACE inhibitory peptide sequences, and its amino acid sequence was Tyr-Asp-Gly-Gly-Val-Phe-Arg-Val-Tyr-Thr. The purified inhibitor competitively inhibited ACE and also showed a clear antihypertensive effect in spontaneously hypertensive rats (SHR) at a dosage of 1 mg/kg body weight.

Molecular Cloning and Characterization of Chymotrypsin Inhibitor and Chitin-Binding Protein Homologs from the Bumblebee Bombus terrestris

  • Qiu, Yuling;Yoon, Hyung-Joo;Jin, Byung-Rae
    • International Journal of Industrial Entomology and Biomaterials
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    • 제25권1호
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    • pp.115-121
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    • 2012
  • The bumblebee Bombus terrestris is widely used in greenhouses to pollinate crops. Here, we report the molecular cloning and characterization of chymotrypsin inhibitor and chitin-binding protein homologs from B. terrestris. Two cDNAs encoding chymotrypsin inhibitor (Bt-CI) and chitin-binding protein (Bt-CBP) homologs were cloned from B. terrestris. Gene sequence analysis showed that Bt-CI gene consists of three exons encoding 75 amino acids, including a predicted 20-amino acid signal peptide, while Bt-CBP consists of two exons encoding 78 amino acids, including a predicted 26-amino acid signal peptide. The mature Bt-CI and Bt-CBP peptides contain ten and six conserved cysteine residues, respectively. Database searches using the deduced sequences of Bt-CI and Bt-CBP showed similarity to those from B. impatiens (96% peptide sequence identities). Bt-CI and Bt-CBP were expressed in both the venom gland and fat body of B. terrestris worker bees. The recombinant Bt-CI and Bt-CBP peptides were expressed in baculovirus-infected insect cells. Taken together, our findings describe the molecular characterization of Bt-CI and Bt-CBP from B. terrestris.

Isolation of Angiotensin Converting Enzyme Inhibitory Peptide from Beef Bone Extract Hydrolysate

  • Park, Eun-Hee;Cho, Yong-Sik;Song, Kyung-Bin
    • Applied Biological Chemistry
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    • 제41권4호
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    • pp.270-272
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    • 1998
  • Angiotensin converting enzyme (ACE) inhibitor was isolated from beef bone extract hydrolysate. After hydrolysis of beef bone extract with a commercial protease, ACE inhibitory peptide was purified by using ultrafiltration, gel permeation chromatography, and reverse-phase high pressure liquid chromatography. The purified ACE inhibitor was a pentapeptide, Gly-Pro-X-Gly-Pro.

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Starch Phosphorylase and its Inhibitor from Sweet Potato Root

  • Chang, Tsung-Chain;Su, Jong-Ching
    • 생약학회지
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    • 제17권2호
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    • pp.134-138
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    • 1986
  • Based on a tracer study, starch phosphorylase was implicated as an agent in the starch synthesis in sweet potato roots. The enzyme was purified from the tissue as a cluster of isozymes with an average mw of 205K (fresh roots) or 159K (roots stored for 3 mon.). On SDS polyacrylamide gel electrophoresis, one large subunit of 98K mw and several small ones of 47${\sim}57K mw were observed. From the mw data and the results of peptide mapping and immunoelectrophoretic blotting using mono- and polyclonal antibodies, it was deduced that a large part of the large subunit was cleaved at the middle part of the peptide chain to give rise to the small subunits, and on storage, the enzyme molecules were further modified by proteolysis. During the course of phosphorylase purification, a proteinaceous inhibitor of the enzyme was isolated. It had a mw of 250K and was composed of 5 identical subunits of 51K mw. In the direction of starch synthesis, the inhibitor showed a noncompetitive kinetics with a Ki of $1.3{\times}10^{-6}\;M$. By immunohistochemical methods, both the enzyme and the inhibitor were located on the cell wall and amyloplast. Crossreacting materials of the inhibitor were present in spinach leaf, potato tuber and rice grain. These findings indicate the wide occurrence of the inhibitor and also imply its possible participation in regulating starch phosphorylase activity in vivo.

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c-Jun N-Terminal Kinase Signaling Inhibitors Under Development

  • Han, Sun-Young
    • Toxicological Research
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    • 제24권2호
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    • pp.93-100
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    • 2008
  • Targeting protein kinases has been active area in drug discovery. The c-Jun N-terminal kinases(JNKs) have also been target for development of novel therapy in various diseases, since the roles of JNK signaling in pathological conditions were revealed in studies using jnk-deficient mice. Small molecule inhibitors and peptide inhibitors are identified for therapeutic intervention of JNK signaling pathway. SP-600125, an anthrapyrazole small molecule inhibitor for JNK with high potency and selectivity has been widely used for dissecting JNK signaling pathway. CC-401 is the first JNK inhibitor that went into clinical trial for inflammation and leukemia. Inhibitor for mixed lineage kinase (MLK), CEP-1347 also negatively regulates JNK signaling, and tried for potential use in Parkinson's disease. Cell-permeable peptide inhibitor D-JNKI-1 is being developed for the treatment of hearing loss. The current status of these JNK inhibitors and safety issue is discussed in the minireview.

Peptide Inhibitor for Human Immunodeficiency Virus Type 1 (HIV-1) Protease from a Thermolysin Hydrolysate of Oyster Proteins

  • Lee, Tae-Gee
    • Fisheries and Aquatic Sciences
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    • 제13권1호
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    • pp.84-87
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    • 2010
  • A peptide that inhibits HIV-1 protease was isolated from a hydrolysate of oyster (Crassostrea gigas) proteins digested with thermolysin. The peptide was using membrane filtration, gel permeation chromatography, ion exchange chromatography, and reverse-phase high performance liquid chromatography. Amino acid sequence of the peptide was determined to be Val-Phe-Glu-Leu. Chemically synthesized Val-Phe-Glu-Leu showed an $IC_{50}$ value of 106 ${\mu}M$.

Production and Characterization of Antihypertensive Angiotensin I-Converting Enzyme Inhibitor from Pholiota adiposa

  • Koo Kyo-Chul;Lee Dae-Hyoung;Kim Jae-Ho;Yu Hyung-Eun;Park Jeong-Sik;Lee Jong-Soo
    • Journal of Microbiology and Biotechnology
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    • 제16권5호
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    • pp.757-763
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    • 2006
  • Angiotensin I-converting enzyme (ACE) inhibitors have generally been very useful to remedy or prevent hypertension. This study describes the extraction and characterization of an ACE inhibitor from the fruiting body of Pholiota adiposa ASI 24012, which can be used as an antihypertensive drug. The maximal ACE inhibitory activity $(IC_{50};0.25mg)$ was obtained when the fruiting body of Pholiota adiposa ASI 24012 was extracted with distilled water at $30^{\circ}C$ for 12 h. After the purification of ACE inhibitor with ultrafiltration, Sephadex G-25 column chromatography, and reverse-phase HPLC, an active fraction with an $IC_{50}$ of 0.044 mg was obtained. The purified ACE inhibitory peptide was a novel pentapeptide, showing very little similarity to other ACE inhibitory peptide sequences. The molecular mass of the purified ACE inhibitor was estimated to be 414 daltons with a sequence of Gly-Glu-Gly-Gly-Pro, and showed a clear antihypertensive effect on spontaneously hypertensive rats (SHR) at a dosage of 1 mg/kg.

Calcitonin Gene-related Peptide Suppresses Pacemaker Currents by Nitric Oxide/cGMP-dependent Activation of ATP-sensitive K+ Channels in Cultured Interstitial Cells of Cajal from the Mouse Small Intestine

  • Choi, Seok;Parajuli, Shankar Prasad;Yeum, Cheol Ho;Park, Chan Guk;Kim, Man Yoo;Kim, Young Dae;Cha, Kyoung Hun;Park, Young Bong;Park, Jong Seong;Jeong, Han Seong;Jun, Jae Yeoul
    • Molecules and Cells
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    • 제26권2호
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    • pp.181-185
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    • 2008
  • The effects of calcitonin gene-related peptide (CGRP) on pacemaker currents in cultured interstitial cells of Cajal (ICC) from the mouse small intestine were investigated using the whole-cell patch clamp technique at $30^{\circ}C$. Under voltage clamping at a holding potential of -70 mV, CGRP decreased the amplitude and frequency of pacemaker currents and activated outward resting currents. These effects were blocked by intracellular $GDP{\beta}S$, a G-protein inhibitor and glibenclamide, a specific ATP-sensitive $K^+$ channels blocker. During current clamping, CGRP hyperpolarized the membrane and this effect was antagonized by glibenclamide. Pretreatment with SQ-22536 (an adenylate cyclase inhibitor) or naproxen (a cyclooxygenase inhibitor) did not block the CGRP-induced effects, whereas pretreatment with ODQ (a guanylate cyclase inhibitor) or L-NAME (an inhibitor of nitric oxide synthase) did. In conclusion, CGRP inhibits pacemaker currents in ICC by generating nitric oxide via G-protein activation and so activating ATP-sensitive $K^+$ channels. Nitric oxide- and guanylate cyclase-dependent pathways are involved in these effects.

김으로부터 분리한 Angiotensin-I Converting Enzyme 저해제의 정제 및 특성 (Purification and Characterization of Angiotensin I-Converting Enzyme Inhibitor from Porphyra yezoensis)

  • 최수진;전우진;유광원;신동훈;홍범식;조홍연;양한철
    • 한국식품영양과학회지
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    • 제29권4호
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    • pp.719-725
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    • 2000
  • 본 연구는 70여종의 국내산 해조류중 가장 높은 ACE 저해 활성을 보였던 김(Porphyra yezoensis, 서천)의 산가수분해물로부터 ACE 활성 저해 펩타이 드를 분리하여 그 특성을 조사하였다. ACE 저해물질의 분획은 균일하게 파쇄한 김을 2.5 N HCl로 산 가수분해한 후 중화하여 한외여과로 분자크기 3 kDa 이하의 물질로 분리하였다. 분자크기 3 kDa이하의 물질에 대하여 column chromatography(Amberlite XAD 8, DEAE-Toyopearl, Sephadex LH-20)와 reverse phase HPLC(C18)를 순차적으로 수행하여 ACE 저해제인 PY3--II-b-h5물질을 분리하였다. PY30-II-b-h5는 분자크기는 약 580 dalton으로 glycine(24.5%), arginine(56.8%), proline(18.8%)의 아미노산 조성을 갖는 저분자 펩타이드였으며, ACE의 저해양상은 경쟁적 저해작용을 하였고, IC50 값은 10.6$\mu\textrm{g}$/mL 이었다.

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Combinatorial Solid Phase Peptide Synthesis and Bioassays

  • Shin, Dong-Sik;Kim, Do-Hyun;Chung, Woo-Jae;Lee, Yoon-Sik
    • BMB Reports
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    • 제38권5호
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    • pp.517-525
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    • 2005
  • Solid phase peptide synthesis method, which was introduced by Merrifield in 1963, has spawned the concept of combinatorial chemistry. In this review, we summarize the present technologies of solid phase peptide synthesis (SPPS) that are related to combinatorial chemistry. The conventional methods of peptide library synthesis on polymer support are parallel synthesis, split and mix synthesis and reagent mixture synthesis. Combining surface chemistry with the recent technology of microelectronic semiconductor fabrication system, the peptide microarray synthesis methods on a planar solid support are developed, which leads to spatially addressable peptide library. There are two kinds of peptide microarray synthesis methodologies: pre-synthesized peptide immobilization onto a glass or membrane substrate and in situ peptide synthesis by a photolithography or the SPOT method. This review also discusses the application of peptide libraries for high-throughput bioassays, for example, peptide ligand screening for antibody or cell signaling, enzyme substrate and inhibitor screening as well as other applications.